/**
 * Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
 */
package com.excel2sql.chenjun.fileparse;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import com.excel2sql.chenjun.fileparse.annotation.ExcelField;
import com.excel2sql.chenjun.refle.Reflections;
import com.google.common.collect.Lists;

/**
 * 导入Excel文件（支持“XLS”和“XLSX”格式）
 * 
 * @author ThinkGem
 * @version 2013-03-10
 */
public class ImportExcel
{
	/**
	 * 工作薄对象
	 */
	private Workbook wb;

	/**
	 * 工作表对象
	 */
	private Sheet sheet;

	/**
	 * 标题行号
	 */
	private int headerNum;

	/**
	 * 构造函数
	 * 
	 * @param path
	 *            导入文件，读取第一个工作表
	 * @param headerNum
	 *            标题行号，数据行号=标题行号+1
	 * @throws InvalidFormatException
	 * @throws IOException
	 */
	public ImportExcel(String fileName, int headerNum) throws InvalidFormatException, IOException
	{
		this(new File(fileName), headerNum);
	}

	/**
	 * 构造函数
	 * 
	 * @param path
	 *            导入文件对象，读取第一个工作表
	 * @param headerNum
	 *            标题行号，数据行号=标题行号+1
	 * @throws InvalidFormatException
	 * @throws IOException
	 */
	public ImportExcel(File file, int headerNum) throws InvalidFormatException, IOException
	{
		this(file, headerNum, 0);
	}

	/**
	 * 构造函数
	 * 
	 * @param path
	 *            导入文件
	 * @param headerNum
	 *            标题行号，数据行号=标题行号+1
	 * @param sheetIndex
	 *            工作表编号
	 * @throws InvalidFormatException
	 * @throws IOException
	 */
	public ImportExcel(String fileName, int headerNum, int sheetIndex) throws InvalidFormatException, IOException
	{
		this(new File(fileName), headerNum, sheetIndex);
	}

	/**
	 * 构造函数
	 * 
	 * @param path
	 *            导入文件对象
	 * @param headerNum
	 *            标题行号，数据行号=标题行号+1
	 * @param sheetIndex
	 *            工作表编号
	 * @throws InvalidFormatException
	 * @throws IOException
	 */
	public ImportExcel(File file, int headerNum, int sheetIndex) throws InvalidFormatException, IOException
	{
		this(file.getName(), new FileInputStream(file), headerNum, sheetIndex);
	}

	/**
	 * 构造函数
	 * 
	 * @param path
	 *            导入文件对象
	 * @param headerNum
	 *            标题行号，数据行号=标题行号+1
	 * @param sheetIndex
	 *            工作表编号
	 * @throws InvalidFormatException
	 * @throws IOException
	 */
	public ImportExcel(String fileName, InputStream is, int headerNum, int sheetIndex) throws InvalidFormatException, IOException
	{
		if (StringUtils.isBlank(fileName))
		{
			throw new RuntimeException("导入文档为空!");
		}
		else if (fileName.toLowerCase().endsWith("xls"))
		{
			this.wb = new HSSFWorkbook(is);
		}
		else if (fileName.toLowerCase().endsWith("xlsx"))
		{
			this.wb = new XSSFWorkbook(is);
		}
		else
		{
			throw new RuntimeException("文档格式不正确!");
		}
		if (this.wb.getNumberOfSheets() < sheetIndex)
		{
			throw new RuntimeException("文档中没有工作表!");
		}
		this.sheet = this.wb.getSheetAt(sheetIndex);
		this.headerNum = headerNum;
	}

	/**
	 * 获取行对象
	 * 
	 * @param rownum
	 * @return
	 */
	public Row getRow(int rownum)
	{
		return this.sheet.getRow(rownum);
	}

	/**
	 * 获取数据行号
	 * 
	 * @return
	 */
	public int getDataRowNum()
	{
		return headerNum + 1;
	}

	/**
	 * 获取最后一个数据行号
	 * 
	 * @return
	 */
	public int getLastDataRowNum()
	{
		return this.sheet.getLastRowNum() + headerNum;
	}

	/**
	 * 获取最后一个列号
	 * 
	 * @return
	 */
	public int getLastCellNum()
	{
		return this.getRow(headerNum).getLastCellNum();
	}

	/**
	 * 获取单元格值
	 * 
	 * @param row
	 *            获取的行
	 * @param column
	 *            获取单元格列号
	 * @return 单元格值
	 */
	public Object getCellValue(Row row, int column)
	{
		Object val = "";
		try
		{
			Cell cell = row.getCell(column);
			if (cell != null)
			{
				if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC)
				{
					val = cell.getNumericCellValue();
				}
				else if (cell.getCellType() == Cell.CELL_TYPE_STRING)
				{
					val = cell.getStringCellValue();
				}
				else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA)
				{
					val = cell.getCellFormula();
				}
				else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN)
				{
					val = cell.getBooleanCellValue();
				}
				else if (cell.getCellType() == Cell.CELL_TYPE_ERROR)
				{
					val = cell.getErrorCellValue();
				}
			}
		}
		catch (Exception e)
		{
			return val;
		}
		return val;
	}

	/**
	 * 获取导入数据列表
	 * 
	 * @param cls
	 *            导入对象类型
	 * @param groups
	 *            导入分组
	 */
	public <E> List<E> getDataList(Class<E> cls, int... groups) throws InstantiationException, IllegalAccessException
	{
		List<Object[]> annotationList = Lists.newArrayList();
		// Get annotation field
		Field[] fs = cls.getDeclaredFields();
		for (Field f : fs)
		{
			ExcelField ef = f.getAnnotation(ExcelField.class);
			if (ef != null && (ef.type() == 0 || ef.type() == 2))
			{
				if (groups != null && groups.length > 0)
				{
					boolean inGroup = false;
					for (int g : groups)
					{
						if (inGroup)
						{
							break;
						}
						for (int efg : ef.groups())
						{
							if (g == efg)
							{
								inGroup = true;
								annotationList.add(new Object[] { ef, f });
								break;
							}
						}
					}
				}
				else
				{
					annotationList.add(new Object[] { ef, f });
				}
			}
		}
		// Get annotation method
		Method[] ms = cls.getDeclaredMethods();
		for (Method m : ms)
		{
			ExcelField ef = m.getAnnotation(ExcelField.class);
			if (ef != null && (ef.type() == 0 || ef.type() == 2))
			{
				if (groups != null && groups.length > 0)
				{
					boolean inGroup = false;
					for (int g : groups)
					{
						if (inGroup)
						{
							break;
						}
						for (int efg : ef.groups())
						{
							if (g == efg)
							{
								inGroup = true;
								annotationList.add(new Object[] { ef, m });
								break;
							}
						}
					}
				}
				else
				{
					annotationList.add(new Object[] { ef, m });
				}
			}
		}
		// Field sorting
		Collections.sort(annotationList, new Comparator<Object[]>()
		{
			public int compare(Object[] o1, Object[] o2)
			{
				return new Integer(((ExcelField) o1[0]).sort()).compareTo(new Integer(((ExcelField) o2[0]).sort()));
			};
		});
		// Get excel data
		List<E> dataList = Lists.newArrayList();
		for (int i = this.getDataRowNum(); i < this.getLastDataRowNum(); i++)
		{
			E e = (E) cls.newInstance();
			int column = 0;
			Row row = this.getRow(i);
			StringBuilder sb = new StringBuilder();
			for (Object[] os : annotationList)
			{
				Object val = this.getCellValue(row, column++);
				if (val != null)
				{
					ExcelField ef = (ExcelField) os[0];

					// TODO 未知注释
					// If is dict type, get dict value
					// if (StringUtils.isNotBlank(ef.dictType())){
					// val = DictUtils.getDictValue(val.toString(),
					// ef.dictType(), "");
					// log.debug("Dictionary type value: ["+i+","+colunm+"] " +
					// val);
					// }

					// Get param type and type cast
					Class<?> valType = Class.class;
					if (os[1] instanceof Field)
					{
						valType = ((Field) os[1]).getType();
					}
					else if (os[1] instanceof Method)
					{
						Method method = ((Method) os[1]);
						if ("get".equals(method.getName().substring(0, 3)))
						{
							valType = method.getReturnType();
						}
						else if ("set".equals(method.getName().substring(0, 3)))
						{
							valType = ((Method) os[1]).getParameterTypes()[0];
						}
					}
					try
					{
						if (valType == String.class)
						{
							String s = String.valueOf(val.toString());
							if (StringUtils.endsWith(s, ".0"))
							{
								val = StringUtils.substringBefore(s, ".0");
							}
							else
							{
								val = String.valueOf(val.toString());
							}
						}
						else if (valType == Integer.class)
						{
							val = Double.valueOf(val.toString()).intValue();
						}
						else if (valType == Long.class)
						{
							val = Double.valueOf(val.toString()).longValue();
						}
						else if (valType == Double.class)
						{
							val = Double.valueOf(val.toString());
						}
						else if (valType == Float.class)
						{
							val = Float.valueOf(val.toString());
						}
						else if (valType == Date.class)
						{
							val = DateUtil.getJavaDate((Double) val);
						}
						else
						{
							if (ef.fieldType() != Class.class)
							{
								val = ef.fieldType().getMethod("getValue", String.class).invoke(null, val.toString());
							}
							else
							{
								val = Class
										.forName(
												this.getClass().getName()
														.replaceAll(this.getClass().getSimpleName(), "fieldtype." + valType.getSimpleName() + "Type"))
										.getMethod("getValue", String.class).invoke(null, val.toString());
							}
						}
					}
					catch (Exception ex)
					{
						val = null;
					}
					// set entity value
					if (os[1] instanceof Field)
					{
						Reflections.invokeSetter(e, ((Field) os[1]).getName(), val);
					}
					else if (os[1] instanceof Method)
					{
						String mthodName = ((Method) os[1]).getName();
						if ("get".equals(mthodName.substring(0, 3)))
						{
							mthodName = "set" + StringUtils.substringAfter(mthodName, "get");
						}
						Reflections.invokeMethod(e, mthodName, new Class[] { valType }, new Object[] { val });
					}
				}
				sb.append(val + ", ");
			}
			dataList.add(e);
		}
		return dataList;
	}
	
	public List<String> getHeadList()
	{
		List<String> headList = Lists.newArrayList();
		for (int j = 0; j < this.getLastCellNum(); j++)
		{
			headList.add(this.getCellValue(getRow(0), j).toString());
		}
		return headList;
	}

	/**
	 * 导入测试
	 */
	public static void main(String[] args) throws Throwable
	{

		ImportExcel ei = new ImportExcel("d:/342290/Desktop/export.xlsx", 0);

		for (int i = ei.getDataRowNum(); i < ei.getLastDataRowNum(); i++)
		{
			Row row = ei.getRow(i);
			for (int j = 0; j < ei.getLastCellNum(); j++)
			{
				Object val = ei.getCellValue(row, j);
				System.out.print(val + "-");
			}
			System.out.print("\n");
		}

	}

}
